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《College Mathematics》 2015-01
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The Study About Vertical Tangent Lines of Quadratic Curves

WANG Qing;Ministry of Mathematical and Physical,Suzhou Vocational University;  
We use the method of analytic geometry and projective geometry to discuss the track of intersection point about vertical tangent lines of quadratic curves,and prove that the track of intersection point about vertical tangent lines of ellipse,hyperbolic is circle and the intersection point about vertical tangent lines of parabola is on the directrix and the connection to the point of tangency pass focus.
【CateGory Index】: G634.6
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